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combustible gases (0 to 100%LEL), oxygen (0 to 30%VOL), hydrogen sulfide (0Quell Quell Photoelectric Q301 Hush/Test Smoke Alarm, White Advanced sensor that detects visible particles associated with smouldering firesCHNADKS Carbon Monoxide Detector, CHNADKS Portable CO Detector with Visual Audible and Vibrating Alarm, Rechargeable Carbon Mono Carbon monoxide (CO) gas detector ADKS-1-CO from CHNADKS uses imported sensors with a 3-year lifespan.HUANQIN PTH-9D Intelligent WiFi Carbon Monoxide Detector CO Detector Portable Temperature, Humidity and Air Quality Detector 3 in 1: Multifunctional air quality detector real time monitors CO concentration, temperature and relative humidity in tSHANGLIN SHANGLIN Handheld Carbon Monoxide Detector Portable Carbonic Oxide Concentration Testing Meter with Temperature Test and High Precise Sensor: Adopts high precise electrochemical sensor, quick response, high accurate measurement, with the meaYoungly 5in1 CO2 Meter Air Quality Monitor Temperature Humidity Carbon Dioxide Detector Adopts high-precision semiconductor sensors, with stable working performance, and can accurately detect the carbon dioxiDiewu Diewu Handheld Carbon Monoxide Meter with High Precision CO Gas Tester Monitor Detector Gauge LCD Display Sound and Ligh Portable detector for detecting carbon monoxide(CO) gas.Generic Air Quality Monitor - 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Full-color screen, safe and stableB-Qtech B-Qtech Air Quality Monitor 5 in 1, TVOC HCHO Temperature Humidity CO2 Meter,Rechargeable Air Pollution Analyzer, CO2 De 【5 In 1 Multi Function】 The air quality monitor can detect the carbon dioxide, temperature, humidity, HCHO, TVOC at theHOMSFOU HOMSFOU 3pcs Detector Dust Cover Smokes Detector Dust Caps Lighter Carbon Monoxide Detector Alarm Liquid Covers for Cook detector covers for cooking:practical detector protector is suitable for commercial buildings, residential properties, hDpofirs Smart Air Quality Monitor - Portable CO2 Detector, 9 in 1 Air Quality Tester, PM2.5 PM10 Hcho TVoc Temperature Humidity, FINE SQUARE: Hcho and CO use electrochemical detection technology, TVOC and CO2 use semiconductor detection technology a25% Off KLEIN TOOLS Klein Tools Combustible Gas Leak Detector, Detection range: ~50 to 10,000 ppm*, ET120 Combustible Gas Leak Detector: This portable gas leak tool provides audible and visual alarms in the presence of methaneALKOY ST9700 Handheld Carbon Monoxide Meter with High Precision Testing Meter Monitoring Detector Gauge LCD Color Display Soun Staright Staright Tuya WiFi Intelligent Air Housekeeper 6-in-1 Air Quality Monitor PM2.5/Formaldehyde/TVOC/CO2/Temperature/Humidi 6 in 1 : Intelligent air quality detector, real time monitoring of 6 environmental parameters such as PM2.5, formaldehydAntallcky Handheld CO Detector, 80db Light CO Leak Detector, High Precision, Portable, CO Gas Analyzer with LCD Display, Handheld CO Meter Handheld The Carbon Monoxide Detectors monitor the CO concentration in the air，high precision sensing . 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ThereTemtop Temtop Air Quality Monitor CO2 Detector Professional Carbon Dioxide PM2.5 PM10 Formaldehyde Temperature and Humidity Mon 8-IN-1 MULTIFUNCTIONAL CO2 MONITOR. Adopts SenseAir NDIR carbon dioxide sensor, Dart HCHO sensor, and Temtop professionaplplaaoo CO2 Detector, Indoor Air Quality Monitor, CO2 Meter, Portable Carbon Dioxide Detector, USB Charging Thermometer Hygromet Real-time monitor: The carbon dioxide monitor can record the carbon dioxide concentration in the air in real time, and fInficon Inficon CO Check Carbon Monoxide Meter Large, easy-to-read LCD screen for precise CO measurementALLmeter ALLmeter Portable CO2 and TVOC Monitor,Rechargeable Carbon Dioxide Detector with Color and Sound Alerts,Indoor Air Quali Dual Function,Comprehensive Monitoring: This CO2 detector simultaneously monitors CO2 and TVOC levels. 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